Materials Literature
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Calculations and experiments applying voltage to a test cell simulating a high-resistance conducting path in series with a cavity in polyethylene are discussed. These experiments generated chemical changes on the surface wall of the cavities for both subcorona currents (currents produced by voltage below critical ince…
The efficient synthesis of three new vinylogous derivatives 6–8 of bis(ethylenedithio)tetrathiafulvalene (BEDT–TTF) is described; cyclic voltammetry establishes that the new donors have significantly lower solution oxidation potentials than that of BEDT–TTF, and the single crystal X-ray structure of compound 8 is desc…
The effects of chemisorbed sulphur on the hydrogen adsorption and evolution in aqueous acid solution are reviewed for well-controlled surfaces of platinum, nickel, iron and silver. The hydrogen underpotential adsorption (HUA) on platinum is poisoned by adsorbed sulphur. The hydrogen evolution reaction (HER) on Pt, Ni,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGeneralized synthesis of cis- and trans-dioxorhenium(V) (bi)pyridyl complexesM. S. Ram and Joseph T. HuppCite this: Inorg. Chem. 1991, 30, 1, 130–133Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Published inissue 1 January 1991https://…
All articles of this category Sapphyrin, so called due to its intense blue-green color, is a 22 π-electron pentapyrrolic molecule known for over 20 years. This macrocycle can now be prepared in good yield and is becoming the subject of serious current study. Although planar and aromatic, the larger size of this "expan…
Abstract Plasma‐induced polystyrene radicals were first studied by electron spin resonance (ESR). The room temperature ESR spectrum was compared with those obtained by γ‐irradiation, UV‐irradiation, and mechanical fracture. It was found that even less than a few seconds of plasma‐irradiation gave rise to a large amoun…
The effects of remote nitrogen plasma, remote oxygen plasma, and corona discharge treatments on linear low-density polyethylene were studied with regard to the chemical and physical surface modification, depth of modification, and surface stability. An attempt was made to correlate the type and the extent of modificat…
The effects of pH and Al on the acidophilic diatom Asterionella ralfsii var. americana Körn. were examined in axenic batch cultures. Experiments were performed under conditions of both high (pH 5) and low (pH 6) Al solubility over a range of concentrations from 0 to 30 µ mol liter −1 total Al. Growth rates were analyz…
Part 1 Characterization of polymer molecules: chemical composition of polymeric chains molecular mass of polymers molecular mass distribution in polymers - general characterization of the distribution curve. Part 2 Arrangement of polymers and polymer morphology: the two-phase structure of polymers - crystallinity meth…
All articles of this category 2-Dimethoxyphosphoryl-5,6-dihydro-1,3-dithiolo[4,5- b ][1,4]-2-dithiin ( 8 ) and 2-triphenylphosphonio-5,6-dihydro-1,3-dithiolo-[4,5- b ][1,4]dithiin tetrafluoroborate ( 9 ) have been obtained in four steps from 4,5-ethylenedithio-1,3-dithiole-2-thione ( 4 ) (ca. 75% overall yield). Depro…
Elevated temperature (1 023 to 1 193 K) tensile properties are described for a fine (6 μm) and coarse (100 μm) grained ultrahigh carbon (1.25 %) steel containing 10 % aluminum. The coarse-grained steel exhibits Class I solid solution alloy behavior wherein a stress exponent of three is noted. The fine-grained steel ex…
Crystal structures are known for aspartate carbamoyltransferase (ATCase) in the T and R states, with and without the allosteric activator adenosine triphosphate (ATP) or inhibitor cytidine triphosphate (CTP). Visual inspection of X-ray crystal structures does not provide all of the information necessary for the determ…
In this paper we review experimental and theoretical findings related to the recently discovered mechanism of moisture-induced environmental embrittlement in FeAl-based alloys. We show that when low aluminum content FeAl alloys (35 and 36.5% Al) are tested in air, the aluminum in the alloys reacts with moisture in the…
The mixed crystal ${\mathrm{Rb}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$(${\mathrm{NH}}_{4}$${)}_{\mathit{x}}$${\mathrm{H}}_{2}$${\mathrm{AsO}}_{4}$ (RADA) has been investigated for several values of (x=0,0.12,0.15, and 0.20) by measuring the complex dielectric permittivity along the a tetragonal axis in the temperature…
Sulfate-reducing bacteria can cause or influence corrosion in both carbon (or low-alloy) steels and stainless steels. The electrochemical reactions and rate-controlling processes are quite different in these two cases, the common feature being the catalysis of anodic dissolution by adsorption of hydrogen sulfide. In t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFactors determining the site of electroreduction in nickel metalloporphyrins. Spectral characterization of nickel(I) porphyrins, nickel(II) porphyrin .pi.-anion radicals, and nickel(II) porphyrin .pi.-anion radicals with some nickel(I) characterK. M. Kadish, M. M. Franzen, B…
The combined use of small-angle X-ray scattering (SAXS) and photon correlation spectroscopy (PCS) to characterise adsorbed layers of β-casein at the solid/liquid interface is reported. The protein was adsorbed to polystyrene latex particles at room temperature, low ionic strength and neutral pH and adsorption densitie…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGeneration and oligomerization of bicyclo[2.2.2]octyne and properties of tris(bicyclo[2.2.2]octeno)benzene obtained from the linear trimerKoichi Komatsu, Shuji Aonuma, Yasuhisa Jinbu, Ryotaro Tsuji, Chitaru Hirosawa, and Kenichi TakeuchiCite this: J. Org. Chem. 1991, 56, 1,…
We report the synthesis and structure of a novel hexanuclear copper complex of the anion of 6-methyl-2-hydroxypyridine (MeL), which undergoes reaction with lanthanum nitrate to give [La8Cu12(OH)24(NO3)22(MeLH)13(H2O)6][NO3]2[MeLH]2·CH2Cl2, a copper–lanthanoid complex with several unique structural features.
The synthesis of a new copper(II) phthalocyaninate substituted with four 15-membered tetraazamacrocycles from 15,16-dibromo-2,5,9,12-tetra(toluene-p-sulphonyl)-2,3,4,5,6,7,8,9,10,11,12,13-dodecahydro-1H-2,5,9,12-benzotetraazacyclopentadecine is described. Quaternization of the aza groups leads to water-soluble product…